Plug for boiler-tubes or hollow shafting.



H. T. MASON.

PLUG r011 130mm TUBES 0B HOLLOW snn'rme.

APPLICATION rum: nun. 1a, 1912.

Patented July 29, 1913.

IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII 1 uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu l- [7177/1 1702 T/Zasan Witnesses UNITED STA'llES PAEENT HENRY r. MASON, or memoir. moment.

PLUG roe BOILE -Tunas on HOLLOW srm'r'rnm.

Specification of Letters Eatcnt.

Patented Julygfi lfilii.

Application filed March s, gia. Serial 30.4,164.

To a7Z whom it may concern: a

Be it known that I, HENRY TuMAsoN, a c tizen of the United States ofjAmerica, residing at Detroit, in the-county of \Vayne and State of ivlichigan, have invented certain new and useful Improvements in Plugs for Boiler-Tubes or Hollow Shafting, of which the following is a specification, refcreuce being had therein to the ..accompanying drawings. 7 l

My invention relatesto improvements in stoppers for boiler tubes or hollow shafting, and resides in the peculiar construction, atrangement and combination of parts, as merc fully hereinafter described and particularly pointed out in the claims. In the drawings,-Figure 1 isa sectiona view through a boilertuheshowing my improved device applied thereto; and Fig. 2

is a section on the line w--w of Fig 1.

While my improved stopper is adapted for vario-ususes, it is particularly designed to be employed for repairing tubes for boilers of the type in which the water. or steam irculates aroun the b the latt r rv= ing as flues for the heated gases. I will therefore describe my invention in connece tion With this type of boiler.

A represents one of the tube sheet's'of the boiler, B a tube, and D my improved stopper. The eXpansible-bolt for the stopper comprises a shaft or rod E, a wedge F havably held together by a split resilient ing a screw-threaded engagement with the inner end of the 'shaft, and an cxpansible head G formed f a plurality of radial sections arranged about't'he wedge and yield spring H.

I J are complementary packing rings, between which is arranged an expanding ring K. Upon the shaft E beyond the packing J is a tubular sleeve L of a greater size than the shaft, forming a space therebetween, the purpose of which will hereinafter appear.

1 is the packing cap, N O packings pO- sitioned intermediate the cap and the end of the sleeve L,-and P the clampingnut, the latter being preferably provided with a packing ring Q. 1

In use, assuming that the tube is broken at R, the parts are arranged Withinthe tube so that the expansible packing is below the rupture R, as shown in Fig. 1. The clamping nut is then tightened, which causes the head to expand, the'wedge F firmly clamping the latter to the wall of the tube; In order to insure thefdesired frictional engagement between l the tube wall and the head sectionsflhe 'outer lfaces of the sections are preferably. narrowed or roughened. After the head Gjsclamped to thetube wall, a further adjustmentpf the will stand up for the desired length of time under the intense heat it is subjected to.

Especially is this true ifit is n'ecessaryto nut causes the expansion of the. packing v repair the tube at a point adjacentthefire pot. To overcome this objection I have' me vided means for water-cooling the parts. Thus, the sleeve is provided with One more openings or apertures S, andthe 011%! end off-the Shea is providedwith a bQJ T which communicates with the space between the shaft and the sleeve by means of o'ne or mor 0 inni gs U, w ile then'u P i formed ho low. hen the stopper 'is in place, steam or water is of course free to enter the tube through an opening R, butthe expansible packing will prevent the steam from passing below the same. The steam will therefore pass through apertures S and Uto the bore T, and from the latter to the hollow cap. By this arrangement, the "arious parts of the stopper are effectively water-cooled. 1

Another very desirable feature of my improved structure is. that it permits the. ex-

pansible packing to be readily adjusted in relation to the shaft, so that the pack ng may occupy the proper position in relation to the rupture in the tube. Thus. if'the tube is ruptured ata point considerably below the one shown ,in the drawing, the wedge can be adjusted longitudinally of the shaft and a longer sleeve employed; also, 1f the rup- .ture is adjacent the tube sheet, it is merely necessary to adjust the nut longitudinally of the rod and substitute a sleeve of proper length.

While I have shown and described the preferred construction of my improved stopper, I do not desire to limit myself to the specific structure illustrated.

\Vhat I claim as my invention is,

1. The combination of an operating rod, an adjustable wedge thereon, an expansible head surrounding the wedge, an eitpaneihle packing, a packing cap, an adjusting nut,

- and means intermediate the cap and packing for expanding the latter upon the adjustment of said nut.

2. In a stopper for boiler tubes the com- 7 bination of an expanding bolt including an I pansible packing on the latter, a hollow nut adjustably engaging said rod and having the hollow chamber thereof in communication with said bore, and means-cooperating with the nut and expanding bolt for expanding said packing, said bore being adapted to communicate with the interior of the tube. 4. In a stopper for boiler tubes, the contbination with an operating rod' provided with a bore, a wedge thereon, an expansible.

head surrounding the wedge, a sleeve loosely surrounding said rod, an expansible packing'between said head and the sleeve, a cap nut beyond the sleeve, and an adjusting nut for clamping said parts, said sleeve and bolt having transverse openings therethrough, for the purpose described.

7 nosayes 5. In a stopper for boiler tubes, the combinatlon with an operating rod provided with a bore, a wedge thereon, an expansible head surrounding the wedge, a sleeve loosely surrounding said rod, an expansible packing between said head and the sleeve, a cap nut beyond the sleeve, and a hollow adjusting nut for clamping said parts, the hollow chamber of said nut being in communication with said bore.

G. In a stopper for boiler tubes, the combination of a rod, a wedge thereon, an expansible head surrounding said wedge, a sleeve upon the rod, expansible packing between the head and sleeve, a cap packing intermediate the cap and the sleeve, and a nutior clamping the parts" 7. In a stopper for boiler tubes, the combination of a rod, a wedge longitudinally adjustably engaging the rod, an expansible head surrounding said wedge, a sleeve upon .the rod, expansible packing between the head and sleeve, a cap packing intermediate the cap and the sleeve, and a nut for clamping the parts.

In testimony whereof I atiix my signature in presence of two'witnesses.

HENRY T. MASON.

Witnesses W. J. Bnnnnar,

' JAMES P. BARRY. 

